Juan Quintana
A famous peak
One of the most famous peaks around the Lake Ossian is Bealach Dubh. The journey there and back is about 20 km, and it is listed as a Munro, as it surpasses the required 1,000 meters. In winter it can be a real death trap, with more than 2 feet of snow and temperatures of -36C. So it's better to try to climb it in spring or summer, but even then you'll need to be sure to bring the right equipment. As long as you book in advance, you can make the hostel at Lake Ossian your base camp. From the top of the mountain you'll have indescribably beautiful views.
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